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In Reply to: RE: Here are the readings of chokes I got on my LC-102 posted by Lew on June 24, 2016 at 09:26:33
I've wondered whether that could be due to the voltage and current supplied across the choke when the reading is made. In other words, the choke might behave more up to spec or beyond in terms of Henries, when used in circuit.
The inductive reactance of an inductor increases as the frequency across it increases so depending on the frequency they tested these chokes at and where our testers are testing them at,we are going to get different readings.I assume they are tested at 120hz.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
For a given inductance, the relationship between frequency and reactance would be linear. What I wonder is what voltage and current are applied by the Sencore to achieve a reading for inductance and whether those unknown parameters could be causing an artifactually low reading for L.
On inductor test for value,I did measure 5vdc at the output leads before I hooked it to the choke to be tested.Once I hooked my voltmeter across the choke being tested,I measured no AC or DC voltage at all..
I did do a ringing test and they passed and I also did a 10% tolerance test and the chokes passed..I got 12 rings on each.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
For a given inductance, the relationship between frequency and reactance would be linear. What I wonder is what voltage and current are applied by the Sencore to achieve a reading for inductance and whether those unknown parameters could be causing an artifactually low reading for L.
What about the fact that the 320mh chokes read higher than the rated value? Either the chokes aren't consistent with their specified values or they are tested at a specified voltage and current or frequency to achieve their stated value.I can measure the voltage and current out of the sencore.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
If you don't apply DC current while making the measurement, the results won't be accurate. I raised this topic here on the forum sometime back. See the image above and the link below...
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